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R. M. LOGIE Sept. 17, 1963 ACCUMULATOR SELF-RESTORING CARRY PAWL MECHANISM Filed NOV. 22, 1957 2 Sheets-Sheet l INVENTQR RUSSELL M. LO GI E ATTORNEY United States Patent Rand Qorporation, New York, N311, a corporation of Delaware Filed Nov. 22, 1957, Ser. No. 698,277 7 Claims. (Cl. 2351l37) This invention relates to new and useful improvements in adding machines and has particular reference to improvements in the carry mechanism and the fugitive one mechanism.

An object of the invention is to provide a carry mech anism in which the acumulator carry pawls are restored by spring action and the zero stop plate is likewise restored restored when the rack moves back from the carry position to the zero position. This eliminates the use of complicated external restoring means previously employed.

Another object is to provide an improved fugitive one mechanism provided with the usual fugitive one cradle, but wherein the element for driving the same is a simple element which can be readily and easily disposed at any point along the bank of accumulators so as to permit one part of the bank to function as on adding bank and the other portion to act as a mere counter.

Further and more specific objects, features and advantages will more clearly appear when taken in connection with the accompanying drawings which form part of the specification and illustrate one embodiment of the invention.

In brief and general terms the invention concerns the usual accumulator wheel and rack of any order to which is connected a carry disk having thereon a carry tooth. Associated with the carry disk is a carry trip pawl which is moved by the carry tooth and restored by a spring as soon as the tooth has passed beyond the tip of the pawl. As the trip pawl is moved it engages and moves a stop plate to move the some from a normal position. As the stop plate is moved a latch member is automatically moved to latch the stop plate in moved position. A rack of the next higher order is provided with stop and trip lugs and as the rack moves to carry position the trip lug contacts the latch to release it and allow a spring to move the stop plate toward normal position. The stop plate is held from normal position by the stop lug on the rack. When the rack restores to zero position, a spring connected to the stop plate restores the plate to its normal stop position in front of the stop lug on the rack.

A further feature includes a fugitive one bail which extends from the accumulator of highest order in a bank of accumulators to the accumulator of lowest order. Each accumulator in the bank has associated with it a trip pawl and the other elements just above described. A bail trip lever is positioned to extend between the trip pawl mechanism of any higher order and the fugitive one bad so as to operate the bail and thus, in the usual manner, to set certain accumulator control mechanisms associated with the accumulator of lowest order. By thus selectively positioning the bail trip lever with respect to any desired accumulator in a bank of acumulators the bank maybe split up into one set acting as a mere counter and the other set acting as on adding device, with the usual carry functions.

The invention in its prefer-red form is illustrated in the drawings of which FIG. 1 is a vertical section taken through a bank of accumulator wheels as illustrated in FIG. 2;

FIG. 2 is a partial plan view of a part of the accumulator of an adding machine;

FIG. 3 is an enlarged partial vertical section taken on the line 3-3 of FIG. 2;

FIG. 4 is a partial vertical transverse section taken on the line 4-4 of FIG. 1; v

FIG. 5 is a detail elevation of a trip carry pawl and its related stop plate;

FIG. 6 is an end elevation of the fugitive one carry bail;

PEG. 7 is an end elevation of a strip carry pawl and its associated fugitive one bail trip lever; and

FIG. 8 is a partial vertical section showing the fugitive bail in operated position,

Reference to the drawings will indicate that the invention concerns on adding machine or the like, having a bank of accumulator wheels it mounted on a shaft 11. To each accumulator wheel 10 is connected a carry disk 12 having a carry tooth 13. In the usual manner each carry disk 12 is on the side of its connected accumulator wheel ll; adjacent the accumulator wheel of the next higher order. Each accumulator wheel is adapted in a well known manner to mesh with either a lower add rock 114 or an upper subtract rack 15. The set of accumulators it} may be shifted up or down from a normal neutral position to mesh with either set of racks by well known control mechanisms (not shown).

Below and in the plane of each carry disk 12 is disposed a carry mechanism which constitutes the essence of this invention. This mechanism comprises a carry trip pawl is loosely mounted for rotation on a shaft 17. The upper portion of this pawl 16 is in the preferred form of a tapered tip 13 which lies in the path of the carry tooth and is engaged thereby when the tooth passes through the carry position. This pawl has a lower dependent arm 19 on which is disposed a stud 2d and to the lower end of this arm is connected a restoring spring 21. A back stop element 22 is disposed to limit the restored position of the pawl as shown in FIG. 3. The lower portion of the pawl 16 also has a rearwardly disposed shoulder 23. As the carry tooth 13 on any disk '12 moves into the carry position, it contacts the tip of the pawl 16 and swings the pawl around the shaft 17 against the resistance of spring 21. As the tooth passes beyond the tip of the pawl, the spring 21 snaps the pawl back to the normal position against the back stop 22.

Disposed in a plane adjacent the pawl 16 is a stop plate 24 rotatable on shaft 17. A dependent leg 25 on the stop plate has a stud 26 to be engaged by the shoulder 23. The stop plate also has a rearwardly extending upper arm 27. As the pawl 16 is swung by the action of the carry tooth as above described, the shoulder 23 engages the stud 26 on the stop plate and swings it to elevate the arm 27 from its normal position. The normal position of this arm is shown in FIG. 1 in the upper part thereof and the elevated position thereof is shown in the lower part of the same figure. A latch arm 28 is disposed in the plane of and below the stud 26 on the stop plate and when the stop plate is elevated the end of this latch arm is raised to lie back of the stud 26 to hold the stop plate in elevated position. This latch arm is pivotally mounted on a bracket plate 29 and has a rear upwardly extending release finger 30. A spring 31 is connected between the stop plate 4 and the latch arm 23 and the effect of this spring is to lift the latch arm 23 when the stud 26 is moved with the stop plate. Normally the end of the latch arm rests on the stud 26 as shown in the upper portion of FIG. 1. The spring 31 also has the function of restoring the stop plate to normal position as will be later set forth.

When the racks we moved forward to add into or subtract amounts from the accumulators they are normally stopped in the zero position by the arm 27 on the zero stop plate 24 as shown in the upper portion of FIG. 1. However, when there has been a carry operation by the carry tooth on one wheel to operate the carry pawl arcades mechanism associated with the rack of next higher order, the stop plate arm 27 is lifted allowing the associated rack to move forward to carry position which is one step forward beyond the zero position thereof. The zero stopping action of the arm 27 is effective because at the rear of each rack there are two laterally disposed lugs 32 and 33. On each rack the lug 32 is disposed at a level to engage the arm 27 of the stop plate when the rack reaches zero position and the arm is not lifted. This is called the Zero stop lug. The lug 33 is disposed at a lower level on the rack and is more to the rear thereon and is called a latch trip lug since, as the rack is moved forwardly by the usual well known mechanisms, the lug 3-3 contacts the latch release finger 3t torelease the'latch 28 and allow the spring 31 to pull down on the stop, plate. It will be perceived that this action cannot take place unless the stop plate arm 27 has been lifted and when it is pulled down as the latch is released the arm will rest upon the top of the zero stop lug 32. Then when the rack is restored to Zero position from the forward carry position in the well known manner the zero stop lug 32. will be moved back and will allow the spring 31 to pull the arm 27 to lie in front of the zero stop lug 32 as shown. At this time all the parts are restored to normal with respect to the carry pawl mechanism which has been actuated and are ready for the next carry operation. This has taken place automatically and Without the use of complicated external and extra restoring devices which only add to the expense of the I machine;

In the operation of the device and with the parts in the position shown in the upper part of FIG. 1, the end 27 of the stop member 24 is in front of the stop lug 32 of the rack 15. Now as the accumulator wheel passes the 9 position the carry tooth l3- thereon engages the tip 1 8 of the trip pawl 16 and swings it from its normal position against the back stop member '22. When thus moved the shoulder 23 on the trip pawl engages the stud 26 on the stop member 24 and elevates the end 27 thereof to the position shown in the lower portion of the FIG. 1. In this position of the stop member 24 it will be seen that itsend portion 27 is above the level of both lugs 32 and 33 of the rack 14. In the normal position of the stop member 24 (shown in the upper part of FIG. 1) the end of the pivoted latch member 28 rests against the stud 26 on the stop member 24, but when the stop memher is elevated, as above mentioned, the stud is moved out of the path of the end of the latch member 28 and allows the spring 31 to pull the latch member into the position shown in the lower portion of FIG. 1 to position its outer end back of this stud to hold the stop memher in the elevated position. In the meantime the trip pawl has been restored to normal position by the spring 21 as above stated. This stop member is held in this elevated position until the lug 33 on the rack 14 in moving forward to carry position engages the rear upper end 39 of the latch member 28 and forces the outer end of the latch member down from in back of the stud 26. thus allowing the spring 31 to pull the stop member 24 down until its outer end 27 rests on top of the stop lug 32 of the rack 14- as shown in FIG. 3. Now as the rack 15 moves to the rear from the carry position to the zero position the lug 32 will be withdrawn from beneath the end 27 of the stop member 24 and allow the spring 31 to pull the stop member 24 down to normal position in front of the lug 32 as shown in the upper portion of FIG. 1. At the time this happens the lug 33 is withdrawn from engagement with the rear end of the latch member to move to position against the stud 26 of the stop member 24 as shown in the upper portion of FIG. 1.

Thus it is seen that the entire mechanism is operated automatically to restore the trip pawl immediately to normal position and to operate the stop member and restore it to normal through the cooperation of the lugs' 32 and 33 on the racks. Thus the mechanism is compact, simple and efiicient and does away with the need of any special, complicated, and expensive restoring mechanism. Especially note in FIG. 3, that when the lug 33 moves the latch member 26 away from the stud 26 the stop member has already been moved down as shown so that when the latch member is allowed to move up under the influence of the spring 31 the stud 26 has already been moved to'a position where the end of the latch member 23 can only rest against the bottom of the stud 26 which is its normal position as shown in the upper portion of FIG. 1.

Another feature of the 'inventionirelates to an improvement in the fugitive one mechanism which enables any One of a bank of accumulators to be selected as the accumulator of the highest order. Tothis end the invention concerns a fugitive .one bail 34- which is loosely rotatable at each end to the shaft 17 and extendsfrom the left side of the highest order wheel to the right side of the lowest order wheel as shown in FIG. 4. At its right end (FIG. 4), it has an upwardly extending arm 35 which when the bail is operated is adapted to set certain well known accumulator control mechanisms (not shown). The normal position of this bail is shown in FIG. 1 and the operated position of this bail is shown in FIG. 8. This bail is operated by a bail trip link 36. This link is loosely rotatable on shaft 17 and at its lower end bears against the bail 34. It is provided with a stud 37 which is acted upon by the shoulder 23 of the carry pawl lid with which it may be associated. When this carry pawl is operated it swings the link and operates the bail. It is to be noted that the link 35 may be positioned at any position along the bank of accumulators if desired. When it is thus positioned intermediate the ends of. the bank, the bank with which it is associated will then act as the highest order of the bank extending from that position to the lowest orders above this position will act merely as a counter. 'lhus the fugitive one mechanism may be employed as to split up the bank into two sections as noted.

Briefly, the operation of the device will now be described:

With the parts in normal position as shown in the upper portion of FIG. 1, it must be remembered that the carry pawl mechanisms for each order are identical for both the upper and lower set of racks. In this portion of FIG. 1 the trip pawl 16 is resting against the back stop member 22 and held there by spring 21. The stop plate arm 27 is disposed just in front of the zero stop lug 32 on the rack 15 and the end of the latch arm 28 is resting upon the stud 26 of the stop plate. Now when the carry tooth- 13 operates the trip pawl 16, the shoulder 23 thereon will engage the stud 2 6 of the stop plate 25' and lift the arm 27 thereof from in front of the lug 32 on the rack; As the stop plate is thus swung, the spring 31 Willpull the end of the latch 28 up in back of the stud 26 on the stop plate and hold the stop plate in this position with the arm 27 lifted above the level of, the zero stop lug of the associated rack. 'In the meantime the trip pawl 16 has been released from the carry tooth and has been restored to normal position by its spring 21. Now as the racks move forward in the usual manner the rack associated with the lifted stop plate arm will be allowed to move forward to the carry position which is one step beyond the zero position thereof. As it moves to this position the lower lug 33, which is the latch release lug, will contact the latch release finger 3i) and will cause the latch arm 28 to be pulled down. Through the spring 31 this downward movement of the latch arm 28 will pull the stop plate arm 27 down until it rests upon the top of the Zero stop lug 32 of the rack. Then when the rack is restored to zero position in the usual manner, this spring will then pull the stop plate arm 27 further down to lie in front of the zero lug 32 on the rack and the end of the latch arm 28 will then rest on top of the stud 26 of the stop plate. In this manner the parts are operated automatically in accordance with the action and movement of the carrytooth and the associated rack without the need for any expensive, complicated and extra external parts to restore the mechanism. The operation of the fugitive one mechanism has already been described.

While I have described what I consider to be a highly desirable embodiment of my invention, it is obvious that many changes in form could be made without departing from the invention and I, therefore, do not limit myself to the exact form herein shown and described, nor to anything less than the whole of my invention as hereinbefore set forth and as hereinafter claimed.

:1. In a machine of the class described having an ordinal series of accumulator wheels with carry teeth thereon and associated diiferential actuator racks representing ascending numerical orders, carry mechanism intermediate the respective orders including a carry trip pawl engaged by a respective carry tooth in the associated order, means to restore the trip pawl to normal position as soon as the carry tooth becomes disengaged therefrom, a stop plate engaged by said trip pawl and moved thereby from a normal stop position relative to the actuator rack of next higher order when the trip pawl is first moved from its normal position, latch means to automatically engage a stud on said stop plate to hold said plate in its moved position when the trip pawl is restored to normal position, said stop plate in moved position enabling a said rack connected to the accumulator wheel of next higher order to move one step beyond zero position to carry position, and means on said rack, when moved to carry position, to trip said latch and disengage said stud to release the stop plate from its held position, and means to restore the stop plate to normal position and the latch means to normal position in non-holding contact with said stud as soon as the rack is restored to zero position.

2. A machine as set forth in claim 1 in which said carry trip pawl has a tip in line with one of said teeth and n gpvable thereby.

3. The invention of claim 2 in which the trip pawl is restored to normal by a spring.

4. The invention of claim 2 in which the stud on the stop plate is associated with the trip pawl, shoulder means on the trip pawl to engage said stud and move the stop plate from a normal position when the trip pawl is moved by said tooth, and spring means for automatically actuating the latch means to hold the stop plate in moved position.

5. The invention of claim 1 including zero stop and latch trip lugs on the rack of next ascending numerical order coacting respectively with said stop plate and with said latch means, shoulder means on the trip pawl, the stud on the stop plate being engageable by said shoulder means for moving the stop plate from a normal position when the trip pawl is moved by one of said carry teeth and a spring extending between the stop plate and the latch means. i

6. In a machine as set forth in claim 5 wherein the zero stop lug is disposed at the rear of its rack at one level, and the latch trip lug is located further to the rear of the same rack and at a lower level and said lugs defining the extent of movement of said rack in a carry operation.

7. In a machine of the class described having an ordinal series of accumulator wheels with carry teeth thereon and associated differential actuator racks representing ascending numerical orders, carry mechanism intermediate the respective orders including the combination of a carry trip pawl engaged by a respective carry tooth in the associated order, a spring connected to the trip pawl to restore the trip pawl to normal position as soon as the carry tooth becomes disengaged therefrom, a stop plate, a stud on the stop plate engageable by the trip pawl to move the stop plate from a normal stop position when the trip pawl is first moved from its normal position relative to the actuator rack of next higher order, a latch plate to hold the stop plate in moved position, a spring extending between the stop plate and the latch plate to move the latch plate to latching position when the stop plate is moved from normal position, said stop plate in moved position enabling said rack connected to the accumulator wheel of next higher order to move one step beyond zero position to carry position, a trip lug and a stop lug on the rear end of said rack and disposed at different levels thereon, said trip lug releasing the latch plate when the rack is moved forward to carry position whereby the spring connected to the stop plate will tend to restore the stop plate to normal position, and an arm on the stop plate moved down to rest on the stop lug when the stop plate is moved down, and said stop plate arm moving down in front of the stop lug when the rack is moved back to zero position.

References Cited in the file of this patent UNITED STATES PATENTS 1,622,790 Klosterman Mar. 29, 1927 2,004,495 Sunstrand June 11, 1935 2,014,561 Dysart Sept. 17, 1935 2,206,141 Vigborg July 2, 1940 2,754,052 Capellaro July 10, 1956 r 2,851,217 Tancred Sept. 9, 1958 2,858,074 Reeves Oct. 28, 1958 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 104 058 September 17, 1963 Russell M. Logie It is hereby certified that ent requiring correction and th corrected below.

error appears in the above numbered patet the said Letters Patent should read as Column 1, line 17, strike out "restored"; column 2, line 7, for "strip" read trip column 6, line 39, strike out "and".

Signed and sealed this 14th day of April 1964.

(SEAL) Attest: EDWARD J. BRENNER ERNEST W. SWIDER Attesting Officer Commissioner of Patents 

1. IN A MACHINE OF THE CLASS DESCRIBED HAVING AN ORDINAL SERIES OF ACCUMULATOR WHEELS WITH CARRY TEETH THEREON AND ASSOCIATED DIFFERENTIAL ACTUATOR RACKS REPRESENTING ASCENDING NUMERICAL ORDERS, CARRY MECHANISM INTERMEDIATE THE RESPECTIVE ORDERS INCLUDING A CARRY TRIP PAWL ENGAGED BY A RESPECTIVE CARRY TOOTH IN THE ASSOCIATED ORDER, MEANS TO RESTORE THE TRIP PAWL TO NORMAL POSITION AS SOON AS THE CARRY TOOTH BECOMES DISENGAGED THEREFROM, A STOP PLATE ENGAGED BY SAID TRIP PAWL AND MOVED THEREBY FROM A NORMAL STOP POSITION RELATIVE TO THE ACTUATOR RACK OF NEXT HIGHER ORDER WHEN THE TRIP PAWL IS FIRST MOVED FROM ITS NORMAL POSITION, LATCH MEANS TO AUTOMATICALLY ENGAGE A STUD ON SAID STOP PLATE TO HOLD SAID PLATE IN ITS MOVED POSITION WHEN THE TRIP PAWL IS RESTORED TO NORMAL POSITION, SAID STOP PLATE IN MOVED POSITION ENABLING A SAID RACK CONNECTED TO THE ACCUMULATOR WHEEL OF NEXT HIGHER ORDER TO MOVE ONE STEP BEYOND ZERO POSITION TO CARRY POSITION, AND MEANS ON SAID RACK, WHEN MOVED TO CARRY POSITION, TO TRIP SAID LATCH AND DISENGAGE SAID STUD TO RELEASE THE STOP PLATE FROM ITS HELD POSITION, AND MEANS TO RESTORE THE STOP PLATE TO NORMAL POSITION AND THE LATCH MEANS TO NORMAL POSITION IN NON-HOLDING CONTACT WITH SAID STUD AS SOON AS THE RACK IS RESTORED TO ZERO POSITION. 